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# responseHeaderFields

The HTTP response headers received from the server upon completion of the upload.

```
var responseHeaderFields: [String : String]? { get }
```

## Return Value

A dictionary of response header fields, or `nil` if the job has not completed or no HTTP response was received.

## Discussion

This property is populated when the job reaches a terminal state (`PHAssetResourceUploadJobStateSucceeded`
or `PHAssetResourceUploadJobStateFailed`). It contains the HTTP response headers returned by the
destination server.

Header field names are normalized to lowercase for consistent lookup.

---

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